These are the 12-15mm ones, Look Keo cleats compatible. They fit near every chainset apart from very fancy ones - from what I could tell. Ive used them on campy and shimano chainsets. Fully working, great for collecting those watts, purchased in Jan 2017, box and bits and bobs included, I do not require such technologies so for sale.

Will work with Wahoo from what I understand, main benefit of these is they are easy to move between bikes